• Code: F2-78
• Description: Registration image density sensor trouble (Transfer belt substrate reflection rate abnormality)
• Causes: Image density (registration) sensor trouble (Sensor sensitivity adjustment trouble). PCU PWB trouble. Connection trouble of the connector and the harness. Image density (registration) sensor dirt. Transfer belt dirt, scratch.
• Remedy: Replace the image density (registration) sensor. Replace the PCU PWB. Harness and connector connection trouble. Clean the image density (registration) sensor. Clean or replace the transfer belt.

• Code: F3-12
• Description: Paper feed tray 1 lift operation trouble
• Causes: LUD1 is not turned ON within the specified time. CLUD1 sensor trouble Paper feed tray 1 lift unit trouble. PCU PWB trouble. Harness and connector connection trouble.
• Remedy: Check connection of the harness and the connector of LUD1. Replace the lift-up unit. Replace the PCU PWB.

• Code: F3-22
• Description: Paper feed tray 2 lift operation trouble
  LUD2 does not turn ON within the specified time
• Causes: LUD2 does not turn ON within the specified time. CLUD2 sensor trouble. Paper feed tray 2 lift unit trouble. PCU PWB trouble. Harness and connector connection trouble.
• Remedy: Check the harness and the connector of LUD2. Replace the lift-up unit. Replace the PCU PWB.

• Code: H2-00
• Description: Thermister open trouble (TH_UM_AD2)
• Causes: Thermister trouble. PCU PWB trouble Connection trouble of the connector and the harness. Fusing unit not installed.
• Remedy: Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble.

• Code: H2-01
• Description: Thermister open trouble (TH_LM)
• Causes: Thermister trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Fusing unit not installed.
• Remedy: Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble.

• Code: H2-02
• Description: Sub thermister open trouble (TH_US)
• Causes: Thermister trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Fusing unit not installed.
• Remedy: Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble.

• Code: H2-03
• Description: Compensation thermister open trouble (TH_UM_AD1)
• Causes: Thermister trouble. PCU PWB trouble Connection trouble of the connector and the harness. Fusing unit not installed.
• Remedy: Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble.

• Code: H3-00
• Description: Fusing section high temperature trouble (TH_UM)
• Causes: The fusing temperature exceeds the specified level. Thermister trouble. PCU PWB trouble Connection trouble of the connector and the harness. Power unit trouble.
• Remedy: Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble. Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble. Replace the power unit.